Onan 25.0 DEH-53R Series Operator's Manual And Parts Catalog page 5

Coolant System
• Coolants under pressure have a higher boiling
point than that of water. DO NOT open a radiator
or heat exchanger pressu re cap or break a system
while the engine is running, and in rio case until
the system pressure has been bled off.
• Radiator fan belts are guarded for your protec-
tion. DO NOT remove covers or guards.
• Keep your hands away from moving parts.
Ventilation System
• Check remote radiators frequently. Remove any
dirt, debris, bird nests, etc.
• Check ventilation louvres frequently. Make sure
that free-fall louvres and motor operated louvres
open and close properly and that there, is no
restriction in the free-air flow.
Electrical System
• The electrical installation exterior to your
generator should have been performed by
qualified licensed electricians. All local and state
codes should have been consulted and complied
with. It is essential that all load circuit breakers
adequately protect electrical functions, a|l cir-
cuits are properly grounded and wiring is correct
capacity.
• Tag open switches.
• DON'T tamper with interlocks.
• Before starting work on the generating set,
disconnect batteries. This will prevent inadver-
tent starting of the set.
• Use extreme caution when making adjustments
on the electrical components in the control
cabinet while the engine is running. High voltages
are present and could cause serious personal
injury.
• DO NOT SMOKE while servicing batteries. Verify
correct polarity of battery cables before connec-
ting. Lead acid batteries give off a highly ex-
plosive hydrogen gas which can be ignited by
electrical arcing or by smoking. When connecting
batteries, connect the ground lead last.